Two New Reports Reviewed
NCEER technical reports are published to communicate specific research data and project results. Reports are written by NCEER-funded researchers, and provide information on a variety of fields of interest in earthquake engineering. The proceedings from conferences and workshops sponsored by NCEER are also published in this series. To order a report reviewed in this issue, fill out the order form and return to NCEER. To request a complete list of titles and prices, contact NCEER Publications, University at Buffalo, Red Jacket Quadrangle, Box 610025, Buffalo, New York 14261-0025, phone: (716) 645-3391; fax: (716) 645-3399; or email: firstname.lastname@example.org .
In addition, NCEER's World Wide Web site offers a complete list of technical reports and their abstracts.
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Evaluation, Prevention and Mitigation of Pounding Effects in Building Structures
R.E. Valles and A.M. Reinhorn, 2/20/97, NCEER-97-0001, 280 pp., $20.00
Pounding between inelastic structures is investigated using an energy approach. A comprehensive state of the art review is first presented. The main characteristics of the pounding problem are identified and formulated in terms of energy. A Pseudo Energy Radius concept is introduced to study: 1) the minimum gap size to avoid pounding; 2) the amplifications due to pounding; and 3) the evaluation of different pounding mitigation techniques, including the use of supplemental damping devices and shock absorbers.
The formulations presented are then summarized to provide structural engineers with simple design/evaluation procedures to solve pounding problems. Building code considerations for pounding are also reviewed. Critical gap to avoid pounding is usually specified in terms of the sum of the maximum displacements, or as a percentage of the height, or as a fixed quantity, or as a SRSS combination of the response. Making use of the improved correlation coefficient based on the above mentioned Pseudo Energy Radius, the Double Difference Combination rule may be used to calculate the critical gap to avoid pounding. The formulation can be extended to determine more rational critical gap formulations in seismic codes.
Proceedings of the U.S.-Italian Workshop on Seismic Evaluation and Retrofit
Edited by D.P. Abrams and G.M. Calvi, 3/19/97, NCEER-97-0003, 266 pp., $20.00
These proceedings represent the second time NCEER and their counterparts, the National Group for the Defense against Earthquakes (GNDT) of the Italian National Research Council, have convened workshops as part of a Memorandum of Understanding. The workshop was held in December 1996 in the U.S. on seismic evaluation and retrofit of buildings and bridges. The invited workshop papers focused on general issues for discussion including: how research has been used to change practice; what problems need to be solved for the next generation of codes; and what research needs may emerge in the next decade through technology advancements. Discussions at the workshop resulted in a series of resolutions that are included in the proceedings.
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